2000 silverado brakes

hi , i replaced alllines on my 2000 silverado and no i am having a hard time trying to bleed the lines,
it seems ok lots of pedal then i drive for a day or two and i get the soft pedal and hard to stop.
is there something out of the norm that has to be done
thanks

if you poped the bleeder for all of the brakes, and got air in then you will need it to go to the dealer (this is usually the only place that has the correct power bleeder for the GM trucks) Though your local shop may be able to do it. the ABS manifolds cannot be bled with out that.